Version 4
SHEET 1 880 680
WIRE 448 -32 80 -32
WIRE 592 -32 448 -32
WIRE 592 -16 592 -32
WIRE 80 16 80 -32
WIRE 0 32 -128 32
WIRE 208 32 160 32
WIRE 448 32 448 -32
WIRE 448 32 288 32
WIRE 0 64 -192 64
WIRE 320 64 160 64
WIRE 448 64 448 32
WIRE 448 64 400 64
WIRE -128 96 -128 32
WIRE 0 96 -128 96
WIRE 592 96 592 64
WIRE -192 128 -192 64
WIRE 0 128 -192 128
WIRE -192 144 -192 128
WIRE 0 176 -80 176
WIRE 208 176 160 176
WIRE 448 176 288 176
WIRE 336 208 160 208
WIRE 448 208 448 176
WIRE 448 208 400 208
WIRE -192 256 -192 224
WIRE 0 256 -192 256
WIRE 240 256 160 256
WIRE -128 304 -128 96
WIRE 80 304 80 272
WIRE 80 304 -128 304
WIRE 448 304 448 208
WIRE 448 304 80 304
WIRE 80 336 80 304
WIRE -80 352 -80 176
WIRE 240 352 240 256
WIRE -80 448 -80 432
WIRE 240 448 240 432
FLAG 80 336 0
FLAG 592 96 0
FLAG -80 448 0
FLAG 240 448 0
SYMBOL Misc\\TL494 80 144 R0
SYMATTR InstName U1
SYMBOL res 192 48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 150
SYMBOL res 304 80 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 150
SYMBOL res 192 192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 12k
SYMBOL cap 336 224 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 0.01µ
SYMBOL res -208 128 R0
SYMATTR InstName R4
SYMATTR Value 50k
SYMBOL voltage 592 -32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 14
SYMBOL voltage -80 336 R0
WINDOW 3 -158 69 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(0 10 1ms 1s 1ms 1ms 2s 2)
SYMATTR InstName V2
SYMBOL res 224 336 R0
SYMATTR InstName R5
SYMATTR Value 2.4k
TEXT -240 472 Left 2 !.tran 2s